A222921 - OEIS

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A222921 as a simple table

n	a(n)
1	4
2	174
3	13571
4	1396408
5	149478882
6	16132176644
7	1743046774975
8	188375987615301
9	20358991721595731
10	2200340247114860719
11	237806554693426088256
12	25701465075957071507864
13	2777742291970854979335967

[4,174,13571,1396408,149478882,16132176644, 1743046774975,188375987615301,20358991721595731, 2200340247114860719,237806554693426088256, 25701465075957071507864,2777742291970854979335967]